Chimney damper



M. ORGEN CHIMNEY DAMPER May 29, 1934.

Filed Dec. 1, 1932 I e a e e e 6 o e .4

INVENTOR MICHAEL OQGEN BY 7 I [4% ATTORNEY Patented May 29, 1934 UlTED STTE S 8 Claims.

This invention relates to new and useful improvements in a chimney damper.

The invention has for an object the provision of a perforated tubular member extending transversely through a chimney and used in conjunction with an ordinary damper in a chimney, said tubular member being located a short distance above said damper, and means for controlling the passage of air into the ends of said tubular member.

The invention still further proposes another arrangement of dampers upon the ends of said tubular members for the purpose of controlling the entrance of air from the ends of the tubular member.

As a further object of this invention it is proposed to prepare the-chimney and the tubular member in such a manner that passages exist on both sides of the tubular member.

Furthermore, the invention contemplates an arrangement whereby different portions of the tubular member are formed with apertures of different sizes and an arrangement whereby the tubular member may be longitudinally adjusted to expose perforations of different sizes within the chimney.

Furthermore, as another object of this invention, it is proposed to arrange funnel-like members upon the ends of said tubular member for the purpose of better directing air into said tubular member.

Furthermore, as another object of this invention, it is proposed to provide a means for simultaneously adjusting the dampers upon the ends of said tubular member.

Still further it is proposed to arrange a connection between the dampers of the tubular member so that when one is adjusted the other automatically follows.

A still further object of this invention is the construction of a device as mentioned which is simple and durable and which may be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:-

Fig. l is a fragmentary side elevational view of a portion of a boiler and chimney equipped with the damper according to this invention.

Fig. 2 is a horizontal sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is a sectional view of the perforated tubular member, per se.

Fig. 4 is an end elevational view of Fig. 3 seen as though looking in the .direction of the line 4-4 of Fig. 3.

Fig. 5 is a view similar to Fig. 2 but illustrating a modified construction.

Fig. 6 is a fragmentary elevational view looking in the direction of the line 66 of Fig. 5.

Fig. 7 is a view similar to Fig. 1 but illustrating a modified form of the device.

Fig. 8 is another view similar to Fig. 1 but illustrating a still further modified form.

The chimney damper according to this invention is used in combination with the chimney 10 having a conventional damper 11. This chimney 10 is shown extended from a boiler 12. The invention is particularly appliable to boilers in that the emciency of the boiler may be materially raised and it is possible to build up desired pressure in a minimum of time. For example, it is possible to build up a pressure of 1 pounds, 2 pounds, 3 pounds or any other pressure. This is not intended as a limitation since the chimney damper may be used on chimneys of other descriptions.

In detail the damper comprises a perforated tubular member 13 extended transversely through the chimney and a short distance above the damper 11 and of a smaller diameter than the chimney forming passages 14 about said tubular member. At each end the tubular member 13 is provided with a damper 15. These dampers comprise a butterfly valve in connection with a stem 16 extended to the exterior and adapted for manual adjustment. Means is pro-- vided for simultaneously operating either of the dampers 15 when the other is adjusted and comprises a link 17 pivotally connected between the dampers on opposite sides of their pivots. The perforations of the tubular member are arranged close together at the bottom, see Fig. 3 wherein the bottom is indicated by reference numeral 18, and larger and spaced further apart at the top. The total checking of the draft by the perforated tubular member will vary depending upon its position of rotation. If the perforated tubular member is turned so that there is a larger area of openings at the top of theperforated member than at the bottom, air drawn in from the atmosphere through the tubular member to supply air to the chimney and so reduce the draft of the furnace, will be much greater than if the perfoto replace the chimney draft with air.

rated tube is turned so that there is a smaller area of openings at the top. Stops 19 are arranged upon each of the ends of the tubular member 13 so as to limit operation of the dampers 15 from their closed positions.

In Figs. and 6 a modification of the invention has been disclosed wherein provision is made for changing the operative air passages of the damper. perforated tubular member 20 extended transversely through the chimney and of a smaller diameter than the chimney forming passages at the front and back and of a sufficient length so as to be capable of sliding longitudinally to various adjusted positions. The perforations of this tubular member are different at different portions. Mainly there are small perforations 21 on one side of the tubular member and larger further spaced perforations 22 on the other side. The ends of the tubular member are provided with dampers as previously explained. A means is also provided for holding the tubular member 20 in one or another longitudinal position. The latter means comprises collars 23 attached upon the sides of the chimney 10 and forming bearings for the sliding of the tubular member 20. Pegs 2 1 project from the tubular member 20 and are adapted in one position of rotation of the tubular member to pass through slots formedin the collars 23 so that longitudinal sliding is possible. Otherwise the pegs 24 are so positioned that the tubular member 20 is restrained against longitudinal sliding. Of course, it may be rotated to a position in which the pegs 24 may pass through the slots 25 to permit sliding.

In Fig. '7 another form of the invention has been disclosed which is very similar to the form shown in Figs. 1-4 except that each of the ends of the perforated tubular member 13 is provided with flared members 27, adapted to better guide the air into the tubular member during the operation of the device.

In Fig. 8 another portion of the invention has been disclosed in which the tubular member 13 is provided with flap valves 28 at the ends constituting the dampers. From each of these flap valves there projects fingers 29. Cords 30 connect with these fingers 29 and are suitably guided through idler loops 31 to a convenient point. The cords 3i) join with each other and at a convenient point terminate in a single end. A rod 32 is located at this convenient point and is for the purpose of providing for the tying of said end thereon. In this manner the flap valves 28 may be simultaneously opened or closed to desired positions. Dot and dash lines in Fig. 8 indicate a certain open position of the valves.

The operation of the chimney damper may best beunderstood by first assuming the end dampers of the tubular member closed. The main damper 11 then controls the passage of the fumes through the chimney. The draft from the furnace may be conveniently controlled by operating the dampers at the ends of the tubular member This additional air is supplied without the necessity of this air actually passing through the boiler construction, or stove if the device is applied to the chimney of astove. The dampers may be adjusted to build up the required pressure as for example, in order to build up a pressure of say five pounds, both of the end dampers of the perforated tubular member may be closed and just the damper 11 be open to produce sufficient draft to the furnace. To obtain pressure of say one More particularly the damper comprises a r and one half pounds the dampers at the ends of the perforated tubular members may be half opened and finally to obtain pressures below one and one half pounds the dampers at the ends of the tubular member may be completely opened. In the latter case it is advisable that the main damper 11 of the chimney be left about closed.

While I have illustrated and described the preferred embodiment of my invention, it is to be understood that I do not limit myself to the preci se construction herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined inthe appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:-

1. In combination with a chimney, a perforated tubular member extending transversely through said chimney-and of a smaller diameter than said chimney thereby forming passages about said tubular member, and dampers in each end of said tubular member.

2. In combination with a chimney, a perforated tubular member extending transversely through said chimney and of a smaller diameter than said chimney thereby forming passages about said tubular member, dampers in each end of said tubular member, and means for simultaneously adjusting said latter mentioned dampers.

3. In combination with a chimney, a perforated tubular member extending transversely through said chimney and of a smaller diameter than said chimney thereby forming passages about said tubular member, dampers in each end of said tubular member, and m ans for simultaneously adjusting said latter mentioned dampers, comprising a rod between said dampers arranged to operate one of the dampers as the other is operated.

4. In combination with a chimney, a perforated tubular member extending transversely through said chimney and of a smaller diameter than said chimney thereby forming passages about said tubular member, dampers in each end of said tubular member, and means for simultaneously adjusting said latter mentioned dampers, comprising a rod between said dampers arranged to operate one of the dampers as the other is operated, said dampers comprising butterfly valves and said rod being connected upon opposite sides of the pivots of said valves.

5. In combination with a chimney, a perforated tubular member extending transversely through said chimney and of a smaller diameter than said chimney thereby forming passagesabout said tubular member, dampers in each end of said tubular member, said tubular member being of a length greater than the diameter of saidchimney and being longitudinally slidable and having longitudinally spaced portions provided with perforations, the perforations in the respective portions being of different sizes and spacing, and means for holding said tubular portions selectively within said chimney.

6. In combination with a chimney, aperforated tubular member extending transversely through said chimney and of a smaller diameter than said chimney thereby forming passages about said.

tubular member, dampers in each end of said tubular member, said tubular member being of a length greater than the diameter of said chimney and being longitudinally slidable and having longitudinally spaced portions provided with perforations, the perforations in the respective portions being of difierent sizes and spacing and means for holding said tubular portions selectively within said chimney, comprising pegs projecting from said tubular member and slots in the chimney, said slots permitting the passage of said pegs in certain positions of rotation of the tubular member to allow sliding thereof.

'7. In combination with a chimney, a perforated tubular member extending transversely through said chimney and of a smaller diameter than said chimney thereby forming passages about said tubular member, and dampers in each end of said 

